Politics and government 47 History 43 Foreign relations 19 World politics 15 Cold War 11 United States 11 Economic conditions 8 Social conditions 7 Vietnam War, 1961-1975 7 Biography 5 Influence 5 World War, 1939-1945 4 Causes 3 Europe 3 Forecasting 3 National security 3 Sources 3 Vietnamese Conflict, 1961-1975 3 Asia, Southeastern 2 Attitudes 2 Congresses 2 Economic forecasting 2 Foreign economic relations 2 Generals 2 Historiography 2 Juvenile literature 2 Korea 2 Korea (North) 2 Korea (South) 2 Korea reunification question (1945-) 2